code: def compute(self):
      return self.score_sum / self.total
  
file_path: NeuralCompression/neuralcompression/metrics/_msssim.py
imports: from typing import Any, Callable, Optional, Sequence
  import torch
  from torchmetrics import Metric
  import neuralcompression.functional
  from neuralcompression.functional._multiscale_structural_similarity import MS_SSIM_FACTORS
label_desc: Use image node_id 3 for calling the MultiscaleStructuralSimilarity obj's underlying member method code with example usage: obj.compute() and returns: unknown